| 摘要 |
<p>Cellulosic fibres or fabrics are dyed using pre-metallized acid dye by pretreating the fabric with a cationic agent having a plurality of cationic centres and optionally aftertreating the dyed material with a cationic polymer. The cationic polymer is desirably a polyquaternary amine material especially a poly(DADMAC) or polyvinylpyridine. Material dyed by the method has a 'washed out' appearance similar to fabrics dyed using the 'Jarofast' process, but the availability of a wide range of pre-metallized dyes gives a wider colour range, and the method enables a wider range of substrates to be dyed successfully, including lyocell fibre materials e.g. those sold under Courtauld's trademark 'Tencel' and blend/union materials with polyamides, easier processing and superior wash and light fastness.</p> |
